One appliance and crew from Buckingham and one from West Ashland attended, along with an officer.
One man was released, uninjured, before they arrived. One woman was released, injured, before they arrived.
Three men were released, injured, and passed into the care of South Central Ambulance Service.
The firefighters provided immediate emergency care and used hydraulic rescue equipment and small gear. They made the scene safe and left the incident in the hands of Thames Valley Police.